Pump



c.1. HINSHAW AND H. B. CAS TOR.

PUMP.

APPLICATION FILED FEB. 21,1920

Patented July 13, 1920.

reaaeaz;

To all/whom it may concern:

umreo {sir res CLAUD J. IrINs'H'Aw ANDHAR' Y B. QASTQEQF LABEL, INDIANA,

v Be it known that we, CLAUD J. HINs Aw and HARRY B. 'CAsToR, citizensof the United States, residing at -Lapel, 1n the county or Madison andState of Indiana, have in vented certain new and useful Improve.

ments in Pumps, of which the following is a specification. Y j

The present invention relates to pumps, and more particularly air pumpsfor inflating tires and the like, though not necessarily limited to thatparticular type.

The primary objectflis to provide means for maintaining ,the packinggasket. or leather properly expanded, so, that leakage due to thedistortion of the same-is eliminated, said means being simple, compact,and at all times effective.

An embodiment of the invention isillustrated in the accompanyingdrawing, which is a longitudinal sectional view through a portion of awell known type of pump, with the expander or spreader in place. a

In the drawings, the base is designated by the reference numeral 1, andcarries the usual cylinder, a portion of which is illustrated at 2.Within the cylinder is located the plunger or piston, consisting ofan'upperclamping disk 3 and a lower clamping disk 4. The upper disk3 isprovided with an upwardly extending tubular boss 5, into which isthreaded the actuating rod 6. The lower portion of the boss 5 iscounterboredand internally threaded to receive the threaded extension 7of the lower clamping plate 4. Between the said clamping plates 3 and 4is located the usual packing gasket or cup 8 having a downwardlyextending flange 9 that operates against the inner face of the cylinderand has the usual tapered lower margin. 7 r

The'boss 5 and extension 7 are furthermore provided with alined internalaxial sockets 10 andll, the lower end of the piston rod 6 constitutingthe upper end of the socket 10 and the lower end of the lower socketbeing formed by an internal shoul der 11 The lower end of the rod 6 isalso;

bored, as illustrated at 12.

Slidably mounted in the sockets 10 and 11 and the bore 12 is a stem 13that pro- Specification of Letters Patent;

vantages of the invention.

, p v 'PatentedJulyl yl fi; Application filed February. 21, 1920. SerialNo. 360,499; '7

the flange let; and the lower end of ,the rod V 6, serves to hold thestem 13 in its lo wermost posit on. The-lower pro ect1ng end or". saidstem 13 is reduced in diameter; 3S

illustrated at 16, and mounted on there'- duo-ed portion is a spreaderdisk 17 prefen;

respond: substantially to the taperof the packing cup 9. I

V "fl ld iththis structure,:it.willbe evident that ably heldiinplacezbyapin 18.2;The edge I or thespreader dlsk liVis: beveled tocorwheirthe piston rod is .reciprocated the f packingleatlier orcupjSwill-operate inlthe' a usualfmanner to perm-rtthe passage otiairon: the upstroke: and insure its zcompression.

on:}the downstroke. lVhenever the piston-is forced to the downward limitof its movement the spreader disk 17 will bes'toppeol by the base 1, andthe continued movement of the piston willcause the beveled edge of saiddisk to operate against the tapered end 2 of the cup and expandor'spread the same,

thus insuring its proper shape and eliminate mg the danger of itsbecoming inwardly from the spirit or sacrificing any 'tion, may beresorted to without departing of the ad .Q- I 1 -'i Havingthus fullydescribed our invention,

what we-claim as new, anddesire to secure by Letters Patent, is l 1. ,Apump comprising a cylinder member and a piston therein having anexpansible packing element, and an expanding device for the packingelement movably mounted on the piston and adapted to engage the cylinderat the end of the piston stroke and be therebycaused to engagethepacking element.

and a piston therein having an expansible packing element, an expandingdevice for the packing element. having: a stem slidably mounted in thepiston and movable intoen I gagement with the packing elementyand" ajspring for yieldinglyholding the expanding device in projecting relationto the packingelement and in a position to strike the end ire piston,and a spring housed in the piston "for normally holding the expandingdevice disengaged from the packing element, and in pro ect1ng relationto the plston to cause i it to engage the end of the cylinder member,

' element.

and thereby operate to expand the packing 1 4. VA pump comprising acylinder member and apiston therein having an expansible packingelement, an actuating device for the piston located outside thecylinder, an expanding device for the packing element having a stemslidably mounted in the piston and movable into engagement with thepacking element, said stem terminating short of the actuating device,and a spring housed in the piston and operating against the stem. 5. Apump comprising a cylinder member and a piston therein having aninternal chamber, said piston havingian expansible packing cup, a diskfor expanding the cup having a stem slidable in thegpiston, and a springin the chamberand' housed by the piston and operating on the stem toyieldingly hold the disk out of coaction with the f cup l c 7 v 6. Apump comprising a cylinder'member and a piston therein, said pistoncomprising by operating on the stem to hold the disk normally out ofcoaction with the flange.

In testimony whereof we aflixour signa- I5 tures in the presence of twowitnesses.

' CLAUDJ. HINSHAW.

HARRY B. CASTOR.

- Witnesses: v Y

i EARL A; TULL',

HENRY W. PARNELL.

